What are the recommended trainings/certifications for citizen developers and RPA developers?

UiPath Academy has more than 70 courses according to different levels of RPA knowledge (beginner, intermediate, advanced), as well as special product-related courses (e.g. Studio, StudioX etc.): UiPath Academy

One can opt for trainings from Citizen Developer Foundation to Solution Architect:

There are many RPA Courses available, you can opt for any one of them: